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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42e413e6dbae56e81d89bed8dbf7f44fc71a62242d2ec6c36fe71d1bcf70f53' 
  AND token = 'IuVgyO/H5/ykOxFtLd41LW+B15u+vVDx1Y1g6tdh1MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}